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A number in parentheses indicates the year of last reapproval. This standard has been approved for use by agencies of the Department of Defense. Density can be evaluated as the apparent overall density includes forming skins or by apparent core density forming skins removed.
Ast values given in parentheses are for information only. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of asttm limitations prior to use.
If the material does not have forming skins, the term overall density is not applicable. Any test specimen preparation, conditioning, dimensions, or testing parameters, or combination thereof, covered in the relevant ASTM materials speci?
If there are no relevant ASTM material speci?
Standard Test Method for Apparent Density of Rigid Cellular Plastics
In this case, the test specimen is the entire sample. Current edition approved April 1, Originally approved in Last previous edition approved in as D – Spray equipment shall be adjusted to the best spray pattern and optimum performance.
Spray apply a minimum 1. After a minimum of 5 min, spray apply a second layer of 3.
For calculation of core density, remove the bottom layer atsm the top skin. For calculation of the apparent overall density, cut a specimen that includes the forming skin. The specimens shall be taken from locations distributed throughout the sample.
Number of Specimens 8. Hold the pressure of the dial foot to 2. In these cases the pressure shall be reduced accordingly.
When a sliding caliper gage is used, the proper setting shall be that point at which the measuring faces of the gage contact the surfaces of the specimen without compressing them. Do not use d1262 steel rule for dimensions less than 25 mm 1 dd1622. Measure all dimensions to a precision of In general, three measurements shall qstm made of each dimension.
A lesser number may be made when the following conditions apply: Measurements per Dimension 1 2 NOTE 3—The air buoyancy effect will vary with time and depends on the open-cell content of the foam. Highly open-celled materials are essentially air-? However, freshly produced closed-cell materials are essentially air-void and will exhibit maximum buoyant effects of air.
SR is the between-laboratories standard deviation of the average. VR is the between-laboratories coefficient of variation of the average.
ASTM D Densimeter for Plastic Measurement
Precision and Bias4 For each material, all the samples were prepared at one source, but the individual specimens were prepared at the laboratories that tested them. Each test result was the average of? Each laboratory obtained one test result for each material. Users of this test method should aatm the principles outlined in Practice E to generate data speci?
The principles of There are no recognized standards on which to base an estimate of bias for this test method. Thus, the value of Wa is zero in the above calculation when the sample is at equilibrium with the air. In this case the calculation for density is identical to the calculation in April 1, 1 Added new 1.
Revised Average value for Material 3 in Table 1.
ASTM D – 08 Standard Test Method for Apparent Density of Rigid Cellular Plastics
Revised Material 4 repeatability interval, E1622. Revised Average value for Material 3 in Table 2. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. Users of this asm are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
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